Journal of Research of the National Bureau of Standards
The effect of mechanical vibration and shock on a group of 500-ohm unsaturated standard cells has been investigated. Vibration studies were conducted at frequencies of 10, 20, 30, 50, 70, 100, 200, 500, and 1,000 cycles per second with accelerations of 1, 2, 5, 7 and 10 gravities (g). The shock studies were conducted with shock durations of 6.2, 11, and 18 milliseconds and shock accelerations of 10, 20, 30, and 40 g. The vibration of the cells produced an alternating component in the emf of the cells at the same frequency as the frequency of vibration and dependent on the magnitude of the acceleration. At low frequencies distortions and harmonics were found in the alternating component of the cell emf. In addition to the alternating component a shift in the cell emf was also observed during vibration which depended on the magnitude of the acceleration and the frequency of vibration. At all frequencies and at 1 g acceleration the cell emf was within the 0.01 percent limit of precision usually assigned to unsaturated cells. A large transient emf often exceeding one millivolt was observed during the shock studies. However, the steady emf of the cell did not change more than two microvolts in the shock study. Neither vibration nor shock had a lasting effect on the emf of the unsaturated cells. Possible sources for the observed transient effects are considered. A method for mounting the standard cells so that mechanical vibration or shock is efficiently transmitted to the test cell is described.
Vol. 66C, No. 2, p. 85
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